In the hustle and bustle of Tokyo, urbanites are busy working to make a living and are under tremendous pressure. When everything is pushed to the limit, tragedy is inevitable. The beautiful and quiet Sagi Tsukiko has become a popular designer with her puppy doll, Malumi. At the same time, she also encounters jealousy from her peers and a bottleneck in her next creation. On her way home at night, Tsukiko was injured and hospitalized. She claimed that she was attacked by a boy holding a bent metal baseball bat and pedaling a golden pulley. After that, attacks by the "ball bat boy" continued to occur. Police officers Zhugari and Ma Ting intervened in the investigation and found that most of the victims were under tremendous pressure before the attack. Soon, the "ball bat boy" was arrested, and it seemed that everything was finally coming to an end, but the whole situation was developing in a worse direction. There are more and more attacks in society, and the "ball bat boy" has also become a puzzling mystery...